How to Fix CVE-2026-27444: Secure Email Gateway (Bundle Sibling)
By Sai Kiran Pandrala. Last verified: 2026-05-25.
CVE-2026-27444 is a sibling vulnerability in the same vendor advisory as CVE-2026-27441. Apply the same patched build and you close both. The technical detail below is what differs.
| Severity | 7.8 (High) |
|---|---|
| Actively exploited? | No public listing in CISA KEV |
| Affected | Secure Email Gateway 0 to <15.0.1 |
| Fixed in | Same patched build as CVE-2026-27441 |
| Type (CWE) | CWE-436 Interpretation Conflict |
What's different about CVE-2026-27444?
SEPPmail Secure Email Gateway before version 15.0.1 incorrectly interprets email addresses in the email headers, causing an interpretation conflict with other mail infrastructure that allows an attacker to fake the source of the email or decrypt it.
How to fix CVE-2026-27444
Apply the patched build per the primary write-up: How to Fix CVE-2026-27441. All commands, verification steps, and rollback notes for Secure Email Gateway are listed there.
Frequently asked questions
Does the CVE-2026-27441 patch close CVE-2026-27444?
Yes. Both CVEs are addressed by the same vendor patch. Applying the patched build closes the full bundle.
Is CVE-2026-27444 listed in CISA KEV?
No public KEV listing at the time of this writing.
Where is the official advisory?
See https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure
References
- Official vendor advisory: https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27444
- CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- Primary: How to Fix CVE-2026-27441
*Written by Sai Kiran Pandrala. Part of the Secure Email Gateway bundle. Full procedure at how-to-fix-cve-2026-27441.*